Removal of lead and cadmium from aqueous waste streams using granular activated carbon (GAC) columns

Reed, Brian E.; Arunachalam, Selvam; Thomas, B.

doi:10.1002/ep.670130123

Cited by 92 publications

(15 citation statements)

References 6 publications

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“…Anthropogenic sources of these heavy metals include wastes from the electroplating and metal finishing industries, metallurgical industries, chemical manufacturing, tannery operations, mine drainage, battery manufacturing, and leachates from landfills and contaminated ground water from hazardous waste sites (Gallagher et al 1990;Reed et al 1994). Sources of human exposure to Cd include atmospheric, terrestrial and aquatic routes (Lopez et al 1994), as well as phosphate fertilizer (Mclaughlin et al 1996).…”

mentioning

confidence: 99%

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Igwe¹,

Abia²

2007

Electron. J. Biotechnol.

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The mobilization of heavy metals in the environment due to industrial activities is of serious concern due to the toxicity of these metals in humans and other forms of life. The equilibrium adsorption isotherms of Cd(II), Pb(II) and Zn(II) ions, detoxification from waste water using unmodified and EDTA-modified maize husk have been studied. Maize husk was found to be an excellent adsorbent for the removal of these metal ions. The amount of these metal ions adsorbed increased as the initial concentration increased. Also, EDTAmodification enhanced the adsorption capacity of maize husk due to the chelating ability of ethylenediamine tetra acetic acid (EDTA). Among the three adsorption isotherms tested, Dubinin-Radushkevich isotherm gave the best fit with R 2 value ranging from 0.7646 to 0.9988 and an average value of 0.9321. This is followed by Freundlich and then Langmiur isotherms. The sorption process was found to be mostly a physiosorption process as seen from the apparent energy of adsorption which ranged from 1.03 KJ/mol to 12.91 KJ/mol. Therefore, this study demonstrates that maize husk which is an environmental pollutant could be used to adsorb heavy metals and achieve environmental cleanliness.

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mentioning

confidence: 99%

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Igwe¹,

Abia²

2007

Electron. J. Biotechnol.

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“…Reed and coworkers Reed, Arunachualam, and Thomas, 1994) used GAC columns for lead and cadmium removal form aqueous waste streams. The authors stated that the critical parameters innuencing GAC column adsorption were column pH and influent characteristics.…”

Section: Activated Carbonmentioning

confidence: 99%

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Fan¹,

Anderson²

1995

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“…Adsorption has advantages over the other methods because of its simple design with a sludge-free environment and can involve low investment in terms of both initial cost and land required. Activated carbon has been recognized as a highly effective adsorbent for the removal of heavy metal ion from the concentrated and dilute metal-bearing effluents (Netzer and Hughes 1984;Reed et al 1994). The high cost of activated carbon has prompted a search for cheaper substitutes.…”

Section: Introductionmentioning

confidence: 99%

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Dubey¹,

Mishra²,

Singhal³

2013

Int. J. Environ. Sci. Technol.

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Heavy metals are a threat to human health and ecosystem. These days, great deal of attention is being given to green technologies for purification of water contaminated with heavy metal ions. Biosorption is one among such emerging technologies, which utilizes naturally occurring waste materials to sequester heavy metals from wastewater. Cadmium has hazardous impact on living beings; therefore, its removal through green and economical process is an important task. The aim of the present study was to utilize the locally available Portulaca oleracea plant biomass as an adsorbent for cadmium removal from aqueous solution. The biomass was obtained after drying and grinding the portulaca leaves and stem. No chemical treatment was done on the adsorbent so that it remained green in a true sense. Batch experiments were performed at room temperature. The critical parameters studied were effects of pH, contact time, initial metal ion concentration and adsorbent dose on the adsorption of cadmium. The maximum adsorption was found to be 72 %. The kinetic data were found to best fit the pseudo-secondorder equation. High adsorption rates were obtained in the initial 45 min, and adsorption equilibrium was then gradually achieved in about 100 min. Adsorption increased with increase in pH for a range 2 and 6. The equilibrium adsorption results closely followed both the Langmuir and Freundlich isotherms. The values of constants were calculated from isotherms. Results indicated that portulaca plant biomass could be developed as a potential material to be used in green water treatment devices for removal of metal ions.

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Removal of lead and cadmium from aqueous waste streams using granular activated carbon (GAC) columns

Abstract: The use of granular activated carbon ( G A C ) columns to treat metal-bearing wastewaters was investigated. Synthetic wastewaters containing Pb and Cd

Cited by 92 publications

References 6 publications

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

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